Finance & Accounting · Quaderno + Claude
Quaderno MCP with Claude: Automate Invoicing, Tax Calculations and Compliance Reports
The short answer
Claude works with Quaderno through the Model Context Protocol (MCP), an open standard that acts as a secure adapter between the two. Once connected with an API key, Claude can read billing and tax information and carry out approved actions such as creating invoices, checking tax calculations and preparing compliance reports, all through plain-English requests.
What is Quaderno?
Quaderno is a tax compliance platform that automates tax calculations, invoicing and reporting for businesses selling across many countries. It is used by finance teams, bookkeepers, accountants, and software companies that sell digital or subscription services. It helps businesses apply the right tax rules to each sale and keep records ready for filing without relying on manual work in spreadsheets.
How Claude connects to Quaderno through MCP
The Model Context Protocol (MCP) is an open standard that lets Claude securely use other software, reading information and taking actions, with permissions the organisation controls. Think of it as a universal adapter between Claude and the tool. Quaderno offers its own MCP server, and businesses can also connect through its direct API, depending on what suits their systems.
Once connected, Claude can typically look up customers and invoices, check how tax was calculated on a sale, and help prepare summaries for compliance reports. A finance user might ask in plain language for all unpaid invoices from the last quarter, and Claude can gather that information in seconds rather than requiring someone to run several reports by hand.
Access is limited to what the organisation allows. We set up the connection with an API key and least-privilege access, so Claude only sees and does what is needed. Consequential actions, such as issuing invoices or changing tax settings, can be set to require a person's approval first, and audit logs record what was done and by whom.
What you can automate
Automated invoice creation
When a sale closes in the CRM, Claude can prepare the matching invoice in Quaderno with the correct customer details and line items. A finance team member reviews the draft and approves it before it is sent. This reduces the time spent re-typing order details and lowers the chance of billing errors.
Tax calculation checks
Before an invoice goes out, Claude can check how Quaderno applied tax to a sale, especially for customers in different countries. Staff can ask in plain English why a particular rate was used. This gives accountants a quick way to review unusual cases without digging through settings or reports.
Compliance report preparation
At the end of a period, Claude can gather the sales and tax figures needed for returns and summarise them in a clear table. The finance lead checks the output against their own records before filing. The work moves from hours of exporting data to a short review.
Customer billing questions
Customer service or billing teams can ask Claude to find a customer's subscription status, past invoices or payment history in Quaderno. This helps staff answer queries faster and more accurately, with the information taken directly from the billing record rather than from memory or notes.
Overdue payment follow-up
Claude can identify invoices that are past due and prepare a list grouped by customer and amount. The team then decides which reminders to send. This helps collections staff focus their time on the accounts that need attention most.
An end-to-end workflow: Subscription invoicing and monthly tax close
TriggerA customer renews a subscription in the billing system at the start of each month.
Claude reads the new renewal details from the CRM and matches them to the customer record in Quaderno.
Claude drafts the monthly invoice in Quaderno, applying the tax rules for the customer's location.
A finance team member reviews the draft and approves it, and the invoice is issued.
At month end, Claude gathers all issued invoices and tax amounts into a summary for the accounting team.
The accountant checks the summary against the ledger in Microsoft 365 Excel and flags any differences for follow-up.
OutcomeInvoices go out on time with correct tax, and the month-end close takes a fraction of the usual effort. Typical results vary by business size and the number of billing rules involved.
How we set it up
Free automation audit
We review how your billing and tax work today and identify the workflows worth automating with Quaderno and Claude. You leave with a clear list of priorities and a realistic estimate of the effort involved.
Secure API key connection
We connect Claude to Quaderno using an API key, issued and controlled by your organisation. Access is set to least privilege, so Claude only receives the permissions the chosen workflows need.
Workflow design across your systems
We design the end-to-end process across Quaderno and your other tools such as your CRM, Microsoft 365 or accounting software. Approval points are defined for every action that issues invoices or changes tax settings.
Testing with real past cases
We test the workflows against real past invoices and tax scenarios from your business. Your finance team checks the results, and we adjust the rules until the outputs match what they expect.
Launch, monitoring and training
We launch with monitoring and audit logs turned on, then train your team on how to use Claude with Quaderno safely. We review performance after the first few cycles and refine the workflows as needed.
Who benefits
- Finance director
- Gains clearer visibility of tax and billing across countries and less time spent preparing reports for review.
- Accountant or bookkeeper
- Spends less time on repetitive invoice checks and data gathering, and more on reviewing exceptions.
- Operations or billing manager
- Gets faster answers to customer billing questions without waiting on manual lookups.
- IT or department head
- Keeps control of access and audit trails while introducing a new way to work with billing data.
Security and control
- Access is limited to an API key with least-privilege permissions, set and controlled by your organisation.
- People approve consequential actions such as issuing invoices or changing tax settings before they take effect.
- Audit logs record what Claude accessed and did, supporting internal review.
- Workflows are tested against real past cases before launch, and monitored after go-live.
- Your tax and legal advisers remain responsible for filings and final compliance decisions.
For teams in the US, UK, India and the Middle East
Organisations in the United States and the United Kingdom can use Claude with Quaderno under their own data handling rules. Businesses in India must meet the Digital Personal Data Protection Act, 2023, and we design access and storage to support that. Companies in the UAE and Saudi Arabia must follow local data protection laws, and we choose a hosting region for any custom application to meet those requirements.
Learn more about Claude and MCP
Anthropic's AI model and assistant.
Secure links between Claude and business tools.
How engineers build and change software with Claude.
Hosted agents that run multi-step work.
The open standard Claude uses to connect to tools.
Frequently asked questions
What does the Quaderno MCP server do?
The Quaderno MCP server is a connector that lets Claude communicate with your Quaderno account in a structured way. It allows Claude to read billing and tax information and carry out permitted actions, such as preparing invoices. It works alongside the direct API, and we select the approach that best fits your existing systems.
Is it secure to connect Claude to Quaderno?
Security depends on how the connection is set up. We use an API key with least-privilege access, so Claude only receives the permissions it needs. Approval steps, audit logs and monitoring add further control. Your organisation keeps ownership of the key and can revoke access at any time.
What can Claude do with Quaderno once connected?
Typically, Claude can look up customers, invoices and tax calculations, prepare draft invoices, and gather figures for compliance reports. It responds to plain-English requests. Actions that change records can be set to require human approval before they are carried out.
How long does setup take?
Setup time depends on how many workflows you need and how complex your billing rules are. A focused project often takes a few weeks from the free audit to launch, including testing and team training. We confirm a timeline after the audit.
Which plan or permissions do I need?
You need a Quaderno account that supports API access, and an API key generated within that account. Your administrator decides which permissions the key receives. We recommend a least-privilege setup, and we confirm the exact requirements for your account during the audit.